Question

A laser shined through a diffraction grating with lines that are 1/500 mm apart creates a spectra on a screen. The distance from the center bar to the first side bar is 66 mm. The distance from the diffraction grating to the first side bar is 187 mm. Calculate the wavelength of light (in nanometers) that is being emitted by the laser.

Answer 1

i assume you know the formula d sin(theta)= n (lambda) ?

Answer 2

no

Answer 3

O.O... you have to know the formula to solve this qn

Answer 4

d = (1 mm / 500 lines) = 0.002 mm

Answer 5

yes

Answer 6

and you have n = 1

Answer 7

now you need to find theta, the angle of diffraction.

Answer 8

note : in diffraction grating, the bright fringes are not uniformly spaced like the two slit experiment